Ravelin
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A ravelin is a triangular fortification or detached outwork, located in front of the innerworks of a fortress. Originally called a demi-lune, after the lunette, the ravelin is placed outside a castle
Two ravelins (top left of image) in Goes, The Netherlands
Ravelin in the Dutch town of Bergen op Zoom
Ravelin protecting the entrance of Fort McHenry, Baltimore, Maryland
The Moers fortifications, designed by Simon Stevin, where ravelins appear as triangular shapes surrounded by water, with wall (shown in dark green) facing outwards with no wall on the inner side.
Outwork
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An outwork is a minor fortification built or established outside the principal fortification limits, detached or semidetached. Outworks such as ravelins, lunettes, flèches and caponiers to shield bast
Ravelin
…A ravelin is a triangular fortification or detached outwork, located in front of the innerworks of a fortress (the curtain walls and bastions). Originally called a demi-lune, after the lunette, the ravelin is…
View of the fortifications of Valletta, with the main fortification (a bastion) to the left, the ditch in the centre, and the outwork (a counterguard) to the right